Finding the Fourth Proportional to 1,392.16, 1,921.18 and 802.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.16 : 1,921.18 = 802.69 : x
2. Step 2: Convert to fraction form
   1,392.16/1,921.18 = 802.69/x
3. Step 3: Cross multiply
   1,392.16x = 1,921.18 × 802.69
4. Step 4: Simplify right side
   1,392.16x = 1,542,111.97
5. Step 5: Solve for x
   x = 1,542,111.97/1,392.16
6. Step 6: Final answer
   x = 1,107.71